Patent US3854086A successfully refreshed from Google Patents.
US3854086A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-linear flux detection device utilizing magnetic thin film
Assignee: KDDI Corp
•
Filing: 1972-05-24
•
Granted: 1974-12-10
•
Expires: 1992-05-24
Abstract
Abstract This invention relates to a flux detection device in which using the principle that a flux detection element using plated wire of uni-axial magnetic anisotropic characteristics with a coil thereon, if an exciting signal of predetermined frequency f is applied to the core conductor of said flux detection element to produce a magnetic field less than the anisotropic field, the coil provides a threshold level responsive output signal of frequency 2f, only when an external magnetic field applied to said flux detection element exceeds a predetermined value. The phase of the output signal of frequency 2f obtained at said coil corresponds to the polarity of the external magnetic field applied to said flux detection element. Said flux detection device has many applications, some of which are detection and measurement of magnetic fields, signal conversion from mechanical displacement to an electrical signal using a magnetic field, and ternary valued control system.
Inventors
- 👤 M Higurashi
- 👤 T Sugisaki
- 👤 T Watanabe
- 👤 T Fukui
- 👤 T Ochiai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:39
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; G01R33/04; G01R33/05
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
190 words
A non linear flux detection device utilizing a thin magnetic film comprising: a. a flux detection element comprising a wire, a layer of magnetic material of uni-axial magnetic anisotropic characteristics plated on said wire, and a coil wound on said layer; b. said layer of magnetic material having a hard magnetization axis in the direction of its axis and an easy magnetization axis in the circumferential direction; c. an exciting means connected to said plated wire for applying thereto a predetermined signal of frequency f having a maximum amplitude sufficient only to produce a magnetic field less than the anisotropic magnetic field in said plated wire, and d. a detecting means connected to the output of said coil and arranged to detect the presence of an amplitude of a threshhold level responsive signal of frequency 2f which appears suddenly at the output of said coil when the strength of an external magnetic field in the direction of the hard magnetization axis exceeds a predetermined threshhold level, the threshhold level responsive signal remaining until the external magnetic field drops below said predetermined threshhold level, said threshhold level being greater than zero.
Claim 2
Dependent Claim
190 words
A non linear flux detection device utilizing a thin magnetic film comprising: a. a flux detection element comprising a wire, a layer of magnetic material of uni-axial magnetic anisotropic characteristics plated on said wire, and a coil wound on said layer; b. said layer of magnetic material having a hard magnetization axis in the direction of its axis and an easy magnetization axis in the circumferential direction; c. an exciting means connected to said plated wire for applying thereto a predetermined signal of frequency f having a maximum amplitude sufficient only to produce a magnetic field less than the anisotropic magnetic field in said plated wire, and d. a detecting means connected to the output of said coil and arranged to detect the presence of an amplitude of a threshhold level responsive signal of frequency 2f which appears suddenly at the output of said coil when the strength of an external magnetic field in the direction of the hard magnetization axis exceeds a predetermined threshhold level, the threshhold level responsive signal remaining until the external magnetic field drops below said predetermined threshhold level, said threshhold level being greater than zero.
Claim 3
Dependent Claim
52 words
A non linear flux detection device utilizing a magnetic thin film according to claim 1, further comprising a capacitor connected in parallel with the output of said coil, the capacitance of said capacitor being selected to resonate at a frequency 2f with inductance of said coil for providing an easy parametric excitation.
Claim 4
Dependent Claim
57 words
A non linear flux detection device utilizing a thin magnetic film according to claim 1 wherein the thickness of said film is about 1 Mu , the diameter of saId wire is about 0.2 mm, the number of turns of said coil is 60 and the amplitude of said signal of frequency f is about 70 mA.
Claim 5
Dependent Claim
80 words
A non linear flux detection device utilizing a thin magnetic film according to claim 1, wherein said detecting means for detecting the presence of said signal of frequency 2f comprises: a. an amplifier connected to the output of said coil; b. a counter connected to the output of said amplifier; c. said counter being arranged to count the number of times that an external magnetic field having an amplitude exceeding said threshold level iS applied to said flux detection element.
Claim 6
Dependent Claim
96 words
A non linear flux detection device utilizing a thin magnetic film according to claim 1, comprising: a. a plurality of said elements having the wires thereof electrically connected in series with each other; b. said exciting means being connected to supply an exciting signal of frequency f simultaneously to the wires of said series connected elements; c. A separate amplifier provided for each of said flux detection elements and connected to the output of the coil wound on each plated wire of each respective element, for detecting the presence of a plurality of independent external fields.
Claim 7
Dependent Claim
111 words
A non linear flux detection device utilizing a thin magnetic film according to claim 1 for use as a three level valued control system, wherein said detecting means for detecting the presence of a signal of frequency 2f comprises: a. a doubler connected to the output of said exciting means and arranged to produce an output signal of reference phase and frequency 2f; b. a comparison circuit means for comparing the phase between the output signal of said doubler and the output signal of said coil of said flux detection element; c. said comparison circuit being further arranged to detect the amplitude of the output signal of said flux detection element.
Claim 8
Independent Claim
122 words
A method for detecting magnetic flux comprising the steps of applying a predetermined signal of frequency f to a plated wire of uni-axial magnetic anisotropic characteristics with a coil wound thereon, the plated wire having a hard magnetization axis in an axial direction and an easy magnetization axis in the circumferential direction, the maximum amplitude of the predetermined signal of frequency f being sufficient only to produce a magnetic flux less than the anisotropic magnetic field in said plated wire, placing said plated wire and said coil into the field to be measured, detecting a signal of frequency 2f produced at the output of said coil and appearing suddenly when the strength of the external magnetic field exceeds a predetermined threshhold level.
Claim 9
Independent Claim
122 words
A method for detecting magnetic flux comprising the steps of applying a predetermined signal of frequency f to a plated wire of uni-axial magnetic anisotropic characteristics with a coil wound thereon, the plated wire having a hard magnetization axis in an axial direction and an easy magnetization axis in the circumferential direction, the maximum amplitude of the predetermined signal of frequency f being sufficient only to produce a magnetic flux less than the anisotropic magnetic field in said plated wire, placing said plated wire and said coil into the field to be measured, detecting a signal of frequency 2f produced at the output of said coil and appearing suddenly when the strength of the external magnetic field exceeds a predetermined threshhold level.
References Cited (Backward Citations)
GB592241A
Cited
US3012177A
Cited
US3239754A
Cited
US3400328A
Cited
US3662257A
Cited
US3657641A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |